@article{ref1,
title="There is too much traffic for Alex to walk to school, so we drive. A call to action based on a 42-year trend (Letter)",
journal="British journal of sports medicine",
year="2019",
author="Oliver, Christopher W. and Kelly, Paul and du Feu, Dave and Baker, Graham and Davis, Adrian",
volume="53",
number="6",
pages="334-334",
abstract="<p>[Abstract unavailable]  Keywords: SR2S</p> <p>Language: en</p>",
language="en",
issn="0306-3674",
doi="10.1136/bjsports-2018-099261",
url="http://dx.doi.org/10.1136/bjsports-2018-099261"
}